8 CONTENTS. 



Page. 



Mollusca, by H. Burrington Baker 121 



Introduction 121 



General Discussion 122 



Physiography 1 22 



Sand Dunes 122 



North and Stony Islands 124 



Caseville and the Pigeon River 124 



Rush Lake 125 



Geographic Relations 125 



Aquatic Forms • 125 



Terrestrial Forms 125 



Habitat Study 126 



Aquatic Habitats 126 



Habitats of Saginaw Bay 126 



Habitats of Sand Dune Lakes 131 



Habitats of Rush Lake 133 



Habitats of Swamps .' 137 



Habitats of the Pigeon River 139 



Land Habitats 141 



Habitats of the Sand Dunes 141 



Habitats of North and Stony Islands 144 



Habitats of Creek Flats 147 



Habitats of the Clay Soil 148 



List of Habitats 151 



List of Species 153 



Thysanoptera and Orthoptera, by A. Franklin ShuU 177 



General Introduction 177 



Thysanoptera 178 



Introduction 178 



Scope of Investigations 179 



Methods of Collecting and Preser%ing Specimens 181 



Ecology of the Thysanoptera 182 



Scheme of Classification 182 



Factors Determining Habitat 184 



Habits of Thysanoptera 188 



Locomotion 188 



Reproduction 190 



Dissemination , 192 



Enemies and Checks 200 



Predaceous Animals 200 



Rains 201 



Systematic and Detailed Treatment of Species 204 



Key to Species 205 



List of Species 207 



Summary of Principal Results 214 



Discussion of Economic Aspect 215 



Orthoptera 217 



Introduction 217 



Economic Considerations 217 



Diurnal Acti%1ty of Acridiidae 219 



Ecology 221 



List of Species 222 



Literature Cited 230 



Mallophaga, by Charles A. ShuU and M. A. Carriker, Jr 233 



Introduction 233 



Hints on Collecting 233 



The Huron County Collection 234 



List of Species 235 



Literature Cited 242 



Fish, by A. L. Leathers '. 243 



General Discussion 243 



List of Species 248 



Literature Cited 255 



